Usage

Then start any containers you want proxied with an env var VIRTUAL_HOST=subdomain.youdomain.com

$ docker run -e VIRTUAL_HOST=foo.bar.com ...

The containers being proxied must expose the port to be proxied, either by using the EXPOSE directive in their Dockerfile or by using the --expose flag to docker run or docker create.

Provided your DNS is setup to forward foo.bar.com to the host running nginx-proxy, the request will be routed to a container with the VIRTUAL_HOST env var set.

Image variants

The nginx-proxy images are available in two flavors.

jwilder/nginx-proxy:latest

This image uses the debian:jessie based nginx image.

$ docker pull jwilder/nginx-proxy:latest

jwilder/nginx-proxy:alpine

This image is based on the nginx:alpine image. Use this image to fully support HTTP/2 (including ALPN required by recent Chrome versions). A valid certificate is required as well (see eg. below "SSL Support using letsencrypt" for more info).

Multiple Ports

If your container exposes multiple ports, nginx-proxy will default to the service running on port 80. If you need to specify a different port, you can set a VIRTUAL_PORT env var to select a different one. If your container only exposes one port and it has a VIRTUAL_HOST env var set, that port will be selected.

Multiple Hosts

If you need to support multiple virtual hosts for a container, you can separate each entry with commas. For example, foo.bar.com,baz.bar.com,bar.com and each host will be setup the same.

Wildcard Hosts

You can also use wildcards at the beginning and the end of host name, like *.bar.com or foo.bar.*. Or even a regular expression, which can be very useful in conjunction with a wildcard DNS service like xip.io, using ~^foo\.bar\..*\.xip\.io will match foo.bar.127.0.0.1.xip.io, foo.bar.10.0.2.2.xip.io and all other given IPs. More information about this topic can be found in the nginx documentation about server_names.

Multiple Networks

With the addition of overlay networking in Docker 1.9, your nginx-proxy container may need to connect to backend containers on multiple networks. By default, if you don't pass the --net flag when your nginx-proxy container is created, it will only be attached to the default bridge network. This means that it will not be able to connect to containers on networks other than bridge.

If you want your nginx-proxy container to be attached to a different network, you must pass the --net=my-network option in your docker create or docker run command. At the time of this writing, only a single network can be specified at container creation time. To attach to other networks, you can use the docker network connect command after your container is created:

In this example, the my-nginx-proxy container will be connected to my-network and my-other-network and will be able to proxy to other containers attached to those networks.

Internet vs. Local Network Access

If you allow traffic from the public internet to access your nginx-proxy container, you may want to restrict some containers to the internal network only, so they cannot be accessed from the public internet. On containers that should be restricted to the internal network, you should set the environment variable NETWORK_ACCESS=internal. By default, the internal network is defined as 127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16. To change the list of networks considered internal, mount a file on the nginx-proxy at /etc/nginx/network_internal.conf with these contents, edited to suit your needs:

# These networks are considered "internal"
allow 127.0.0.0/8;
allow 10.0.0.0/8;
allow 192.168.0.0/16;
allow 172.16.0.0/12;
# Traffic from all other networks will be rejected
deny all;

When internal-only access is enabled, external clients with be denied with an HTTP 403 Forbidden

If there is a load-balancer / reverse proxy in front of nginx-proxy that hides the client IP (example: AWS Application/Elastic Load Balancer), you will need to use the nginx realip module (already installed) to extract the client's IP from the HTTP request headers. Please see the nginx realip module configuration for more details. This configuration can be added to a new config file and mounted in /etc/nginx/conf.d/.

SSL Backends

If you would like the reverse proxy to connect to your backend using HTTPS instead of HTTP, set VIRTUAL_PROTO=https on the backend container.

Note: If you use VIRTUAL_PROTO=https and your backend container exposes port 80 and 443, nginx-proxy will use HTTPS on port 80. This is almost certainly not what you want, so you should also include VIRTUAL_PORT=443.

uWSGI Backends

If you would like to connect to uWSGI backend, set VIRTUAL_PROTO=uwsgi on thebackend container. Your backend container should then listen on a port ratherthan a socket and expose that port.

FastCGI Backends

If you would like to connect to FastCGI backend, set VIRTUAL_PROTO=fastcgi on thebackend container. Your backend container should then listen on a port ratherthan a socket and expose that port.

FastCGI Filr Root Directory

If you use fastcgi,you can set VIRTUAL_ROOT=xxx for your root directory

Default Host

To set the default host for nginx use the env var DEFAULT_HOST=foo.bar.com for example

The contents of /path/to/certs should contain the certificates and private keys for any virtualhosts in use. The certificate and keys should be named after the virtual host with a .crt and.key extension. For example, a container with VIRTUAL_HOST=foo.bar.com should have afoo.bar.com.crt and foo.bar.com.key file in the certs directory.

If you are running the container in a virtualized environment (Hyper-V, VirtualBox, etc...),/path/to/certs must exist in that environment or be made accessible to that environment.By default, Docker is not able to mount directories on the host machine to containers running in a virtual machine.

Diffie-Hellman Groups

Diffie-Hellman groups are enabled by default, with a pregenerated key in /etc/nginx/dhparam/dhparam.pem.You can mount a different dhparam.pem file at that location to override the default cert.To use custom dhparam.pem files per-virtual-host, the files should be named after the virtual host with adhparam suffix and .pem extension. For example, a container with VIRTUAL_HOST=foo.bar.comshould have a foo.bar.com.dhparam.pem file in the /etc/nginx/certs directory.

NOTE: If you don't mount a dhparam.pem file at /etc/nginx/dhparam/dhparam.pem, one will be generatedat startup. Since it can take minutes to generate a new dhparam.pem, it is done at low priority in thebackground. Once generation is complete, the dhparam.pem is saved on a persistent volume and nginxis reloaded. This generation process only occurs the first time you start nginx-proxy.

COMPATIBILITY WARNING: The default generated dhparam.pem key is 2048 bits for A+ security. Someolder clients (like Java 6 and 7) do not support DH keys with over 1024 bits. In order to support theseclients, you must either provide your own dhparam.pem, or tell nginx-proxy to generate a 1024-bitkey on startup by passing -e DHPARAM_BITS=1024.

In the separate container setup, no pregenerated key will be available and neither thejwilder/docker-gen image nor the officalnginx image will generate one. If you still want A+ securityin a separate container setup, you'll have to generate a 2048 bits DH key file manually and mount it on thenginx container, at /etc/nginx/dhparam/dhparam.pem.

Wildcard Certificates

Wildcard certificates and keys should be named after the domain name with a .crt and .key extension.For example VIRTUAL_HOST=foo.bar.com would use cert name bar.com.crt and bar.com.key.

SNI

If your certificate(s) supports multiple domain names, you can start a container with CERT_NAME=<name>to identify the certificate to be used. For example, a certificate for *.foo.com and *.bar.comcould be named shared.crt and shared.key. A container running with VIRTUAL_HOST=foo.bar.comand CERT_NAME=shared will then use this shared cert.

How SSL Support Works

The default SSL cipher configuration is based on the Mozilla intermediate profile whichshould provide compatibility with clients back to Firefox 1, Chrome 1, IE 7, Opera 5, Safari 1,Windows XP IE8, Android 2.3, Java 7. Note that the DES-based TLS ciphers were removed for security.The configuration also enables HSTS, PFS, OCSP stapling and SSL session caches. Currently TLS 1.0, 1.1 and 1.2are supported. TLS 1.0 is deprecated but its end of life is not until June 30, 2018. It is beingincluded because the following browsers will stop working when it is removed: Chrome < 22, Firefox < 27,IE < 11, Safari < 7, iOS < 5, Android Browser < 5.

If you don't require backward compatibility, you can use the Mozilla modern profileprofile instead by including the environment variable SSL_POLICY=Mozilla-Modern to your container.This profile is compatible with clients back to Firefox 27, Chrome 30, IE 11 on Windows 7,Edge, Opera 17, Safari 9, Android 5.0, and Java 8.

Other policies available through the SSL_POLICY environment variable are Mozilla-Oldand the AWS ELB Security PoliciesAWS-TLS-1-2-2017-01, AWS-TLS-1-1-2017-01, AWS-2016-08, AWS-2015-05, AWS-2015-03 and AWS-2015-02.

Note that the Mozilla-Old policy should use a 1024 bits DH key for compatibility but this container generatesa 2048 bits key. The Diffie-Hellman Groups section details different methods of bypassingthis, either globally or per virtual-host.

The default behavior for the proxy when port 80 and 443 are exposed is as follows:

If a container has a usable cert, port 80 will redirect to 443 for that container so that HTTPSis always preferred when available.

If the container does not have a usable cert, a 503 will be returned.

Note that in the latter case, a browser may get an connection error as no certificate is availableto establish a connection. A self-signed or generic cert named default.crt and default.keywill allow a client browser to make a SSL connection (likely w/ a warning) and subsequently receivea 500.

To serve traffic in both SSL and non-SSL modes without redirecting to SSL, you can include theenvironment variable HTTPS_METHOD=noredirect (the default is HTTPS_METHOD=redirect). You can alsodisable the non-SSL site entirely with HTTPS_METHOD=nohttp, or disable the HTTPS site withHTTPS_METHOD=nohttps. HTTPS_METHOD must be specified on each container for which you want tooverride the default behavior. If HTTPS_METHOD=noredirect is used, Strict Transport Security (HSTS)is disabled to prevent HTTPS users from being redirected by the client. If you cannot get to the HTTPsite after changing this setting, your browser has probably cached the HSTS policy and is automaticallyredirecting you back to HTTPS. You will need to clear your browser's HSTS cache or use an incognitowindow / different browser.

By default, HTTP Strict Transport Security (HSTS)is enabled with max-age=31536000 for HTTPS sites. You can disable HSTS with the environment variableHSTS=off or use a custom HSTS configuration like HSTS=max-age=31536000; includeSubDomains; preload.WARNING: HSTS will force your users to visit the HTTPS version of your site for the max-age time -even if they type in http:// manually. The only way to get to an HTTP site after receiving an HSTSresponse is to clear your browser's HSTS cache.

Basic Authentication Support

In order to be able to secure your virtual host, you have to create a file named as its equivalent VIRTUAL_HOST variable on directory/etc/nginx/htpasswd/$VIRTUAL_HOST

NOTE: If you provide this file it will replace the defaults; you may want to check the .tmpl file to make sure you have all of the needed options.

NOTE: The default configuration blocks the Proxy HTTP request header from being sent to downstream servers. This prevents attackers from using the so-called httpoxy attack. There is no legitimate reason for a client to send this header, and there are many vulnerable languages / platforms (CVE-2016-5385, CVE-2016-5386, CVE-2016-5387, CVE-2016-5388, CVE-2016-1000109, CVE-2016-1000110, CERT-VU#797896).

Proxy-wide

To add settings on a proxy-wide basis, add your configuration file under /etc/nginx/conf.d using a name ending in .conf.

This can be done in a derived image by creating the file in a RUN command or by COPYing the file into conf.d:

Per-VIRTUAL_HOST

To add settings on a per-VIRTUAL_HOST basis, add your configuration file under /etc/nginx/vhost.d. Unlike in the proxy-wide case, which allows multiple config files with any name ending in .conf, the per-VIRTUAL_HOST file must be named exactly after the VIRTUAL_HOST.

In order to allow virtual hosts to be dynamically configured as backends are added and removed, it makes the most sense to mount an external directory as /etc/nginx/vhost.d as opposed to using derived images or mounting individual configuration files.

For example, if you have a virtual host named app.example.com, you could provide a custom configuration for that host as follows:

If you are using multiple hostnames for a single container (e.g. VIRTUAL_HOST=example.com,www.example.com), the virtual host configuration file must exist for each hostname. If you would like to use the same configuration for multiple virtual host names, you can use a symlink:

Per-VIRTUAL_HOST default configuration

If you want most of your virtual hosts to use a default single configuration and then override on a few specific ones, add those settings to the /etc/nginx/vhost.d/default file. This filewill be used on any virtual host which does not have a /etc/nginx/vhost.d/{VIRTUAL_HOST} file associated with it.

Per-VIRTUAL_HOST location configuration

To add settings to the "location" block on a per-VIRTUAL_HOST basis, add your configuration file under /etc/nginx/vhost.djust like the previous section except with the suffix _location.

For example, if you have a virtual host named app.example.com and you have configured a proxy_cache my-cache in another custom file, you could tell it to use a proxy cache as follows:

If you are using multiple hostnames for a single container (e.g. VIRTUAL_HOST=example.com,www.example.com), the virtual host configuration file must exist for each hostname. If you would like to use the same configuration for multiple virtual host names, you can use a symlink:

Per-VIRTUAL_HOST location default configuration

If you want most of your virtual hosts to use a default single location block configuration and then override on a few specific ones, add those settings to the /etc/nginx/vhost.d/default_location file. This filewill be used on any virtual host which does not have a /etc/nginx/vhost.d/{VIRTUAL_HOST}_location file associated with it.

Contributing

Before submitting pull requests or issues, please check github to make sure an existing issue or pull request is not already open.

Running Tests Locally

To run tests, you need to prepare the docker image to test which must be tagged jwilder/nginx-proxy:test: